/*-------------------------------------------------------------------------
 *
 * postgres_ext.h
 *
 *       This file contains declarations of things that are visible everywhere
 *    in PostgreSQL *and* are visible to clients of frontend interface libraries.
 *    For example, the Oid type is part of the API of libpq and other libraries.
 *
 *       Declarations which are specific to a particular interface should
 *    go in the header file for that interface (such as libpq-fe.h).  This
 *    file is only for fundamental Postgres declarations.
 *
 *       User-written C functions don't count as "external to Postgres."
 *    Those function much as local modifications to the backend itself, and
 *    use header files that are otherwise internal to Postgres to interface
 *    with the backend.
 *
 * This source code file contains modifications made by THL A29 Limited ("Tencent Modifications").
 * All Tencent Modifications are Copyright (C) 2023 THL A29 Limited.
 *
 * src/include/postgres_ext.h
 *
 *-------------------------------------------------------------------------
 */

#ifndef POSTGRES_EXT_H
#define POSTGRES_EXT_H

#include "pg_config_ext.h"

/*
 * Object ID is a fundamental type in Postgres.
 */
typedef unsigned int Oid;

#ifdef __cplusplus
#define InvalidOid        (Oid(0))
#else
#define InvalidOid        ((Oid) 0)
#endif

#define OID_MAX  UINT_MAX
/* you will need to include <limits.h> to use the above #define */

#define atooid(x) ((Oid) strtoul((x), NULL, 10))
/* the above needs <stdlib.h> */


/* Define a signed 64-bit integer type for use in client API declarations. */
typedef PG_INT64_TYPE pg_int64;


/*
 * Identifiers of error message fields.  Kept here to keep common
 * between frontend and backend, and also to export them to libpq
 * applications.
 */
#define PG_DIAG_SEVERITY        'S'
#define PG_DIAG_SEVERITY_NONLOCALIZED 'V'
#define PG_DIAG_SQLSTATE        'C'
#define PG_DIAG_MESSAGE_PRIMARY 'M'
#define PG_DIAG_MESSAGE_DETAIL    'D'
#define PG_DIAG_MESSAGE_HINT    'H'
#define PG_DIAG_STATEMENT_POSITION 'P'
#define PG_DIAG_INTERNAL_POSITION 'p'
#define PG_DIAG_INTERNAL_QUERY    'q'
#define PG_DIAG_CONTEXT            'W'
#define PG_DIAG_SCHEMA_NAME        's'
#define PG_DIAG_TABLE_NAME        't'
#define PG_DIAG_COLUMN_NAME        'c'
#define PG_DIAG_DATATYPE_NAME    'd'
#define PG_DIAG_CONSTRAINT_NAME 'n'
#define PG_DIAG_SOURCE_FILE        'F'
#define PG_DIAG_SOURCE_LINE        'L'
#define PG_DIAG_SOURCE_FUNCTION 'R'

/*-------------------------------------------------------------------------------
 *    shard and extent
 *-------------------------------------------------------------------------------
 */
typedef short ShardID;
#define NullShardId        (0)
#define MAX_SHARDS 4096U
#define InvalidShardID MAX_SHARDS
#define ShardIDIsValid(sid) ((sid) >= 0 && (sid) < MAX_SHARDS)

typedef unsigned int ExtentID;
#define InvalidExtentID MAX_EXTENTS
#define ExtentIdIsValid(eid) ((eid) >= 0 && (eid) < MAX_EXTENTS)

#endif                            /* POSTGRES_EXT_H */
